Pressure-regulator



(N0 Model.)

Patented Aug. 23, 111881.

lime/afar,

UNrrn STATES ATENT Fries.

NELSON CURTIS, OF NEWTON, MASSACHUSETTS.

PRESSURE-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 246,088, dated August23, 1881.

Application filed January 10, 1881.

To all whom it may concern Be it known that I, NELsoN CURTIS, of thecity of Newton, in the county of Middlesex and State of Massachusetts,have invented certain newand useful improvements in pressure-regulatorsapplicable to steam and other distributing and conveying pipes andreservoirs, of which the following is a specification.

The nature of my invention relates to the construction, arrangement, andcombination of a secondary valve with and so as to control the operationof amain valve, substantially as hereinafter more fully set forth, withother members, passages, 860-, as described.

\Vith reference to the drawings, Figure 1 is a sectional elevation onlines 0 d Fig. 2, a sectional plan of part c, the plane of section beingat line f 9. Fig. 3 is an elevation of part h, &c.

Fig. 4 is a section through main valve-seat lon linejj k. Fig. 5 is aplan.

Like letters refer to the same or corresponding parts in all thefigures.

The part or shell It has the chambers n m and inlet and outlet nozzlesor pipes, as indicated by the arrows, 0 being the outlet. It is alsoprovided with the valve 1'', and its seat 1, forming the principal meansof communication between the inlet and outlet pipes. Below or beyond theseat the valve 0' is furnished with a collar or flange, s, in thepassage-way from the valve-seat, and its opposite end is furnished witha piston, it, playing freely in the extension of chamber m. A smallscrew-tap, w, forms an easily graduated escape or passage from inlet orsupply pipe at a into chamber m. Piston t has an excess of area overvalve r.

An auxiliary or secondary valve of smaller dimensions--viz., x--formsthe means of communication between chambers m and a. This valve 00 isseated and guided by part 0, and will close by means of the pressure inchamber m, when permitted to do so, and may be assisted in closingpromptly by spring 0, if desired.

A diaphragm, y, forming one bound or extremity of chamber a, is allowedto act on valve :0 directly, or by means of an adjusting nut or screw onthe stem of valve 00, to push it open, except when the pressure inchamber it rises to a given limit, then the diaphragm y recedes from andallows valve or to close, as described. The diaphragm y is operated uponon the op- (No model.)

posite side from chamber a by means of a spring, I), which is graduatedto a given pressure by means of screw-cap c. The spring I) may actdirectly or through the intervention of a piston, a. The diaphragm maybe se cured in place by means of screw-capi or other suitable means.

The chamber a may be connected to pipe 0 or any of its connections atany other point than that shown--as, for instance, at g on pipe 1).

The collar 8 aids in the prompt closing of valve 1', being placed in thepassage-way from valve-seat l.

The operation is somewhat as follows: The fluid, 850., under pressure,entering the inlet to space it, acts on the excess of area of piston itover that of valve 1", so lifting valve 0 from its seat I, the pressurepassing thus to outlet-pipe 0. The pressure in 0 passes along pipe orpassage 12 into chamber a. When this pressure rises to the limit atwhich spring I) has been adjusted it (the spring) yields, permitting thediaphragm y, actuated by that pressure, to recede from valve 00, sopermitting valve or to close. Valve 00 having closed, pressureimmediately accumulates in chamber m, findingits way through thescrewtap w, as it has all the while preceding, but then escaping throughvalve 00, now confined by the closing of valve or, acts on the excess ofarea of piston t over valve 9", so closing, in part or entirely, thevalve r, and checking or limiting the further increase of pressure inpipe 0 and the pipes and reservoirs to which pipe 0 may be connected.When the pressure in 0 falls below the limit for which spring I) isadjusted it will be equalized in chamber a by means of passage p,allowing diaphragm y to be pushed back by spring I). The diaphragmpushes open valve :0, so relieving the pressure in chamber m, and sopermitting valve 1" to be lifted or opened by the pressure in space a,and inlet-pipe acting on the excess of area of piston I? over that ofvalve r, and so on indefinitely maintaining the pressure in pipe orpipes 0 and their connections at the limited pressure for which springI) is grad uated.'

The leakage around piston t may be used instead of the screw-tap to, butthe latter is preferred, as thereby the amount of leakage or thecapacity of the passage is made easily adjust- 2. Thecollarorflanges,when applied to valve able. 0' so as to intercept or receive impulsefrom I. claim the passing current, substantially as described. 1. In apressure-regulator, the combination NELSON CURTIS. 5 of the collar .9,valve 1*, piston t, and case or Witnesses:

shell h, substantially as and for the purpose D. N. B. OOFFIN, setforth. DWIGHT CHESTER.

